Stator construction

Abstract

According to the invention, the stator of an electrical machine comprises a slotted core and a multilayer bar winding partially received in the core slots and partially accommodated in the air gap of the electrical machine. Interposed between the bars of the multilayer bar winding are spacers whose slots accommodate brace members enveloping each of the bars of the multilayer bar winding on its opposite sides. Each of the brace members is attched to two rollers, one of which is secured in a spring clip received in an axial slot of the stator core, and the other of which is accommodated in a threaded pin received, in turn, in a hole provided in an insulating wedge member. The invention improves the maintainability of the electrical machine, making it as easy to maintain as any conventional slotted machine. The invention also improves the space factor of the electrical machine's air gap and accounts for a better fastening of the multilayer bar winding of the machine's stator.

What is claimed is: 
     
       1. A stator of an electrical machine, separated by an air gap from a rotor, comprising: a core of said stator having slots of a triangular cross-section and half-closed axial slots;   a multilayer bar winding, bars of adjacent layers being staggered and adjoining one another on two sides, bars of a first layer being partially received in said slots of said stator and partially received in said air gap, and bars of remaining layers being accomodated in said air gap;   insulating wedge members having holes and being accomodated in slots of bars of a last layer of said multilayer bar winding to hold all of said layers in place;   spacers having slots interposed between said bars of said multilayer bar winding;   first rollers accomodated in respective half-closed slots of said stator;   second rollers accomodated in said holes of respective insulating wedge members; and   brace members accomodated in said slots of respective spacers and enveloping respective bars of said multilayer bar winding, a first end of each brace member enveloping a respective first roller, and a second end of each brace member enveloping a respective second roller.   
     
     
       2. A stator of an electrical machine as claimed in claim 1, wherein said brace members are constructed as flexible links with stiff ends. 
     
     
       3. A stator of an electrical machine as claimed in claim 1, wherein said brace members comprise a set of elastic steel bands possessing high electrical and magnetic resistances. 
     
     
       4. A stator of an electrical machine as claimed in claim 1, further comprising: spring clips enveloping respective first rollers and being accomodated in respective half-closed axial slots of said stator; and   threaded pins accomodated in said hole of a respective insulating wedge member and in which a respective second roller is accomodated.   
     
     
       5. A stator of an electrical machine as claimed in claim 4, wherein each spring clip includes a flexible springy projection extending into a gap between said core of said stator and a respective bar of said multilayer bar winding. 
     
     
       6. A stator of an electrical machine as claimed in either of claims 4 or 5, wherein said brace members are constructed as flexible links with stiff ends. 
     
     
       7. A stator of an electrical machine as claimed in either of claims 4 or 5, wherein said brace members comprise a set of elastic steel bands possessing high electrical and magnetic resistances.